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It's kind of a old setting server-side, because outlook now lets you have different OoO's for internal and external. The reason it started as an org setting was two reasons:

In past there was only one OoO that worked for internal and external. The Org setting was for admins to set to prevent internal users from accidentally sending personal information to random internet email addresses, like "I'll be on vacation out of area for a week" or "call me on my cell xxx-xxx-xxxx" when they didn't mean for everyone to see it.

2nd to prevent mail loops, but since Exchange 07 that's no longer an issue.